I want to change my cylinder head on my punto active 1,2 8 valve. I have looked on many sites and they all ask for my cast number. I give this and they say nothing in stock to match this number. dose this mean I cant put a head on with out having the same cast number. its a recon head I am after. Nothing wrong with my head I was going to have it terror cleaned but I think a recon head will be better. any advice welcome thanks...